JP5777192B1 - Transfer press machine - Google Patents

Abstract

A transfer press machine capable of forming a cylindrical work having high shape quality is provided. In a transfer press 10 of the present invention, when a blank material B is formed into a cylindrical workpiece W by a blank forming punch 40, a lower pressure member 41 moves the blank material B downward in a drawing hole 38A. And is lowered following the blank forming punch 40. An open / close tool 43 provided on the workpiece receiving stage S1 so as to be able to reciprocate is slidably brought into contact with the pair of gripping members 63, 63 so that the gripping members 63, 63 open and close to receive the cylindrical workpiece W from the blank forming punch 40. . [Selection] Figure 6

Description

  The present invention relates to a transfer press machine that sequentially conveys and forms cylindrical workpieces with one end with a transfer device from the start end side to the end side of a group of processing stages arranged in a line.

  Conventionally, as this type of transfer press machine, a blank material is pushed into a drawing hole of a blank forming die provided above a transfer device by a blank forming punch to form a cylindrical workpiece, and then transferred to the transfer device. Those are known (for example, see Patent Document 1).

JP2003-071524 (FIG. 1)

  However, in the conventional transfer press described above, when the blank material is squeezed, it escapes below the blank forming punch, and as a result, the bottom of the cylindrical workpiece may bulge downward and may not have the shape as designed. . That is, in the conventional transfer press, the shape quality of the cylindrical workpiece formed from the blank material may be lowered.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide a transfer press machine capable of forming a cylindrical work having high shape quality.

  In order to achieve the above-mentioned object, the invention according to claim 1 is characterized in that a cylindrical work piece with one end is intermittently conveyed by a transfer device from the start end side to the end side of a group of processing stages arranged in a row. In addition to forming sequentially, a blank forming die having a drawing hole is provided above the workpiece receiving stage upstream from the processing stage group, and a blank material is pushed into the drawing hole by a blank forming punch, and the cylindrical workpiece is A transfer press machine that transfers to a pair of gripping members on the start end side of the transfer device, and the pair of gripping members on the start end side are supported so as to be able to come into contact with each other and approach each other. In the energized transfer press machine, the workpiece receiving stage is provided so as to be movable up and down, supports the blank material from below, and serves as the blank forming punch. A lower pressurizing member that moves and descends, and is provided so as to be reciprocally movable on the workpiece receiving stage. The cylindrical member is slidably contacted with the pair of gripping members before receiving the cylindrical workpiece, and the cylindrical members are opened. An opening / closing tool comprising: an opening / closing tool that is spaced apart from the pair of gripping members that have received the workpieces, closes the gripping members, and grips the cylindrical workpieces by the pair of gripping members.

  According to a second aspect of the present invention, the opening / closing tool moves up and down between an upper end position interrupted between the pair of gripping members and a lower end position shifted downward of the pair of gripping members. The transfer press machine described in 1.

  According to a third aspect of the present invention, a support base having a linear motion support hole extending on an extension line of the drawing forming hole is provided below the movement region of the pair of gripping members, and the opening / closing tool is A pair of sliding contact projections project from the upper surface of the tool base portion supported by the dynamic support holes so as to be linearly movable, and the pair of sliding contact projections are in sliding contact with the pair of gripping members. The pair of gripping members are configured to open, and the lower pressure member can be directly moved in a through-hole penetrating vertically between the pair of sliding contact protrusions in the tool base portion. The transfer press according to claim 2, which is supported.

  According to a fourth aspect of the present invention, a head portion projecting laterally is provided at an upper end portion of the lower pressure member, and the head portion is configured to fit between the pair of sliding contact projections. A transfer press according to claim 3.

  According to a fifth aspect of the present invention, the opening / closing tool waits at the upper end position in sliding contact with the pair of gripping members moving toward the workpiece receiving stage so that the pair of gripping members are in contact with each other. The transfer press machine according to any one of claims 2 to 4, wherein the transfer press machine opens and closes to the lower end position to close the pair of gripping members.

  The invention according to claim 6 is the invention according to any one of claims 2 to 5, wherein the opening / closing tool is urged to the upper end position and is moved down to the lower end position by being pushed down by the lower pressure member. It is a transfer press machine of description.

  A seventh aspect of the present invention is the transfer press according to any one of the first to sixth aspects, wherein an air cylinder is provided as a drive source for driving the lower pressure member.

  In the transfer press machine according to the first aspect, the blank material is pushed into the drawing forming hole of the blank forming die provided above the workpiece receiving stage by the blank forming punch to form the cylindrical workpiece. At that time, since the lower pressure member supports the blank material from below and descends following the blank forming punch, the downward escape of the blank material, which has been a problem in the past, is suppressed, and high shape quality is achieved. A cylindrical workpiece can be formed.

  Further, the cylindrical workpiece is transferred from the blank forming punch to a pair of gripping members on the start end side of the transfer device. At that time, it is necessary to open the pair of gripping members against the urging force. Here, in the transfer press machine according to the present invention, a pair of open / close tools provided on the workpiece receiving stage so as to be able to reciprocate are slidably contacted with a pair of gripping members to open between the gripping members and receive a pair of cylindrical workpieces. Since the gripping members are closed apart from the gripping members, the cylindrical work can be transferred from the blank forming punch to the pair of gripping members without deeply scratching the cylindrical work. Also in this respect, according to the transfer press machine of the present invention, it becomes possible to form a cylindrical work having high shape quality.

  Generally, in a transfer press machine that forms a cylindrical workpiece from a blank material above the starting end of the transfer device, the periphery of the workpiece receiving stage is narrowed by the blank forming die, the support table that supports it from below, and the components of the transfer device. However, in the configuration of claim 2, the opening / closing tool is arranged to move up and down between the upper end position where the opening / closing tool has interrupted between the pair of gripping members and the lower end position shifted downward of the pair of gripping members. Therefore, the opening / closing tool can be installed without reducing the strength by moving the blank forming die, the support base, etc. away from the workpiece receiving stage.

  According to the configuration of the third and fourth aspects, the opening / closing tool and the lower pressurizing member can be arranged in a compact manner.

  According to the fifth aspect of the present invention, the opening / closing tool opens the pair of gripping members by waiting at the upper end position and slidingly contacting the pair of gripping members moving toward the workpiece receiving stage. The useless waiting time of the gripping member is reduced, and the transfer press can be operated at high speed.

  In the transfer press according to claim 6, since the opening / closing tool is pushed down by the lower pressure member and moves from the upper end position to the lower end position, the drive source is shared between the lower pressure member and the opening / closing tool, and a simple configuration become.

  The transfer press according to claim 7 includes an air cylinder as a drive source for driving the lower pressurizing member, so that the lower pressurizing member is easily moved by the blank forming punch to be lowered by adjusting the atmospheric pressure. Can do.

1 is a front view of a transfer press according to an embodiment of the present invention. Cross section of transfer press machine Front view of an enlarged part of a transfer press Front sectional view of the area around the workpiece receiving stage and idle stage An enlarged side cross-sectional view of a punching press Side sectional view of the periphery of the workpiece receiving stage The top view of the state which the 1st and 2nd workpiece holding part opened The top view of the state which the 1st and 2nd work holding part closed Plan view of first workpiece gripping part and open / close tool Open / close tool perspective view Side sectional view of a state in which the lower end portion of the cylindrical workpiece has entered between a pair of gripping members Side sectional view of timing when cylindrical workpiece is gripped by a pair of gripping members Side sectional view of a state in which the cylindrical workpiece is gripped by a pair of gripping members and the pressure member is disposed at the bottom dead center Side sectional view of the blank workpiece punch withdrawn from the cylindrical workpiece

  Hereinafter, an embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 1, the transfer press machine 10 of the present embodiment is formed by connecting a punching drawing press machine 30 and a drawing press machine 20 on a common base 11. Then, the punching and drawing press 30 punches an elliptical blank B (see FIG. 6) from the hoop material V (see FIG. 6: strip-shaped sheet metal wound in a coil shape) and has an elliptical cross section. A cylindrical workpiece W (see FIG. 2) is drawn, and the cylindrical workpiece W is drawn into a thin container by the drawing press 20 a plurality of times. For this purpose, as shown in FIG. 1, the squeezing press machine 20 includes a plurality of punches 22 arranged in a row at an equal pitch at the lower end of the ram 21 and a plurality of dies 24 corresponding to the group of punches 22 on the bolster 23. Are arranged in a row.

  In the following description, the arrangement direction of the punches 22 is the horizontal direction, the horizontal direction orthogonal to the horizontal direction is the front-rear direction, and the left side in FIG. 1 of the horizontal direction (that is, the transfer press 10 is viewed from the front). The left side is the start side, and the right side is the end side.

  The ram 21 and the bolster 23 of the squeezing press machine 20 are both horizontally long in plan view, and the ram 21 moves both lateral portions up and down to a pair of frame leg portions 25 and 25 erected from the common base 11. Supported as possible. Then, the ram 21 is driven by a first servo motor (not shown), and each punch 22 pushes the cylindrical workpiece W into a die hole (not shown) of each die 24 and forms it. In this way, the portion where the cylindrical workpiece W is formed by the punches 22 and the dies 24 forms the processing stage S3 according to the present invention, and such a plurality of processing stages S3 includes a pair of frame legs 25, 25. They are lined up in a row.

  Further, a knockout pin (not shown) is accommodated in the back side of the die hole of each die 24 so that the punch 22 can be linearly moved. After the punch 22 pushes the cylindrical workpiece W into the die hole and molds it, the punch 22 rises. Alternatively, the knockout pin also rises with a delay and pushes the cylindrical workpiece W out of the die hole.

  Further, the workpiece conveyance holes 25W and 25W shown in FIG. 2 are formed in the middle portion of the frame legs 25 and 25 in the vertical direction, and the extended surface of the upper surface of the die 24 group is inside the workpiece conveyance holes 25W and 25W. It penetrates.

  As shown in FIG. 1, the punching and drawing press machine 30 is disposed on the side of the starting end side of the drawing press machine 20 and, like the drawing press machine 20, a pair of frame leg portions 35 erected from the common base 11. 35 on both sides. The ram 31 is supported by the frame legs 35, 35 so as to be movable up and down, and is driven by a second servo motor (not shown). As shown in FIG. 2, work conveyance holes 35 </ b> W and 35 </ b> W are also formed in the frame leg portions 35 and 35 of the punching and drawing press machine 30 in the same manner as the frame leg portions 25 and 25 of the drawing press machine 20. .

  As shown in FIG. 1, a support base 34 is fixed between positions near the lower ends of the pair of frame legs 35, 35, and the upper surface of the support base 34 is substantially flush with the upper surface of the group of dies 24. It has become. Further, a plate-like communication base 12 is bridged between the drawing press machine 20 and the punching drawing press machine 30, and both end portions of the communication base 12 are received in the work transport holes 25W and 35W. . As shown in FIG. 2, the punching drawing press 30 and the drawing press 20 are formed from a part of the upper surface of the support base 34, the upper surface of the communication base 12, and the upper surface of the die 24 group of the drawing press 20. A belt-like workpiece transfer surface 13 is formed extending across.

  As shown in FIG. 6, support bases 36D and 36D are provided on both side edges of the upper surface of the support base 34 sandwiching the work transfer surface 13 in the front-rear direction, and a punching die holder 36 is provided on the support bases 36D and 36D. Has been handed over. Further, a workpiece lowering hole 36A penetrates in the vertical direction at a position of the punching die holder 36 that faces the center in the width direction of the workpiece conveyance surface 13. The work lowering hole 36 </ b> A has an elliptical cross section, and the major axis direction of the ellipse faces the width direction of the work transfer surface 13.

  On the upper surface of the punching die holder 36, a die receiving recess 36B is formed by recessing the opening edge of the work lowering hole 36A in a stepped shape, and a plate-shaped blank forming die 38 is received therein, and on the die receiving recess 36B. A punching die 37 is received in piles. The blank forming die 38 is formed with an elliptical drawing hole 38A smaller than the work lowering hole 36A, and the punching die 37 is formed with an elliptical punching hole 37A larger than the work lowering hole 36A. . The upper edge corner of the punching hole 37A has an edge structure, and the upper edge corner of the drawing hole 38A is rounded.

  As shown in FIG. 1, the ram 31 of the punching and drawing press 30 includes a first ram 31A supported by the frame leg portions 35 and 35 so as to be linearly movable, and a second piercing through the center of the first ram 31A. It consists of ram 31B. 6 is attached to the first ram 31A, and the elliptical column-shaped blank forming punch fitted inside the punching punch 39 is attached to the second ram 31B. 40 is attached. Then, with the hoop material V laid on the punching die 37, the punching punch 39 enters the punching hole 37 </ b> A and punches the blank material B from the hoop material V. Then, in a state where the blank material B is sandwiched between the blank forming die 38 and the punching punch 39, the blank material B is pushed into the drawing hole 38A by the blank forming punch 40 and formed into the cylindrical workpiece W, and further lowered. The cylindrical workpiece W is moved to the workpiece receiving stage S1 according to the present invention below the workpiece lowering hole 36A (see FIG. 13).

  As shown in FIG. 5, a linear motion support hole 18 is formed through the support base 34 on the same axis as the work lowering hole 36A. Then, the lower pressure member 41 extending from the linear motion support hole 18 is in a state of sandwiching the blank material B with the blank forming punch 40 and descends together with the blank forming punch 40, and the blank material is drawn during drawing. It restricts B from separating from the lower surface of the blank forming punch 40 and bulging downward.

  Specifically, the lower pressurizing member 41 includes first to third pressurizing member constituting portions 41A, 41B, and 41C that are coupled in order from the top. The first pressure member constituting portion 41A is a rectangular plate member whose planar shape extends in the width direction of the workpiece conveying surface 13, and the corners of the four corners thereof are chamfered in an arc shape (see FIG. 9). . The second pressure member constituting portion 41B has a rectangular block structure whose planar shape is slightly smaller than that of the first pressure member constituting portion 41A. The third pressure member constituting portion 41C has a strip shape extending in the vertical direction, and its planar shape is smaller than that of the second pressure member constituting portion 41B in the front-rear direction as shown in FIG. As shown in FIG. 9, it is slightly larger than the second pressure member constituting portion 41B in the lateral direction (see FIG. 9). A pair of lightweight holes 41K (see FIG. 5) is formed in the middle portion in the longitudinal direction of the third pressure member constituting portion 41C. Further, the head portion 41H according to the present invention is constituted by the first and second pressure member constituting portions 41A and 41B.

  As shown in FIG. 5, a relay rod 41D is connected to the lower end portion of the lower pressure member 41, and a direct acting rod 42R of the air cylinder 42 is connected to the lower end portion of the relay rod 41D. Further, the support plate 19 is fixed to the lower surface of the support base 34 so as to cover the linear motion support hole 18, and the relay rod 41 </ b> D is inserted through a rod insertion hole 19 </ b> A penetrating through the support plate 19 in a vertically movable manner. Has been. Furthermore, a plurality of support shafts 19S are suspended from the periphery of the rod insertion hole 19A in the support plate 19, and an air cylinder 42 is fixed to the lower ends of the support shafts 19S. Then, the lower pressure member 41 is driven up and down by the air cylinder 42.

  As shown in FIG. 2, the workpiece transfer surface 13 is provided with a plurality of idle stages S2 between the workpiece receiving stage S1 and the processing stage S3 group. The idle stage S2 group is a portion where the cylindrical workpiece W is stopped without being processed when the transfer device 60 described later intermittently conveys the cylindrical workpiece W, and has the same pitch as the processing stage S3 group. Lined up on the pitch. In addition, one idle stage S2 (hereinafter referred to as “first idle stage S2”) of the idle stage S2 group is located on the support base 34 of the punching and drawing press 30 and the remaining plural stages. The idle stage S2 is located on the communication base 12. In the following description, when the workpiece receiving stage S1, the idle stage S2, and the machining stage S3 are not distinguished, they are simply referred to as “stages”.

  As shown in FIG. 2, a transfer device 60 is provided on the workpiece transfer surface 13 to transfer the cylindrical workpiece W from the start end side to the end end side. The transfer device 60 has a transfer slide 61 extending in the lateral direction. The transfer slide 61 communicates between the ends of a pair of strip-like slide rails 61A and 61A arranged on both side edges in the width direction of the workpiece conveying surface 13 by a pair of connecting members 61B and 61B. It becomes. Further, the entire length of the transfer slide 61 is longer than the work conveying surface 13, and both end portions of the transfer slide 61 protrude from one end and the other end of the transfer press machine 10 as shown in FIG.

  As shown in FIG. 1, a ball nut 65 </ b> N of a ball screw mechanism 65 attached to the outer surface of the punching and drawing press 30 is fixed to the start end portion of the transfer slide 61. Then, the ball screw mechanism 65 is driven by the conveying servo motor 65M, and the transfer slide 61 reciprocates. The pitch of the reciprocating movement of the transfer slide 61 is the same as the pitch of the punch 22 group of the drawing press machine 20.

  As shown in FIG. 2, a plurality of workpiece gripping portions 62 are arranged in the longitudinal direction of the transfer slide 61. The pitch of the workpiece gripping part 62 group is the same as the pitch of the punch 22 group, and the number of the workpiece gripping part 62 group is the same as the number of the stage group.

Each workpiece gripping portion 62 is provided with a pair of gripping members 63 and 63 that face each other with the stage interposed therebetween. When the transfer slide 61 is positioned on the start end side of the movable range, the pair of gripping members 63 and 63 approach each other (hereinafter, this is referred to as “the pair of gripping members 63 and 63 are closed”). Alternatively, when the cylindrical workpiece W is gripped and the transfer slide 61 is positioned at the end of the movable range (hereinafter referred to as “the workpiece gripping portion 62 is closed”), the pair of gripping members 63 and 63 are separated from each other (hereinafter referred to as “the workpiece gripping portion 62 is closed”). As appropriate, the cylindrical workpiece W is released (referred to as “a pair of gripping members 63, 63 is opened” or “a workpiece gripping portion 62 is opened”). Thereby, the cylindrical workpiece W is intermittently conveyed sequentially from the start end side to the end side stage.

  The work gripping part 62 group includes a first work gripping part 62A on the start end side, a plurality of second work gripping parts 62B from the second to a predetermined number on the start end side, and a plurality of remaining third work gripping parts. The opening / closing mechanism of the gripping members 63 and 63 is different for each type of work gripping portion 62. Further, the second work gripping part 62B group is one less than the idle stage S2, and the third work gripping part 62C group is one more than the machining stage S3.

  The second and third workpiece gripping portions 62B and 62C are each provided with a drive source. That is, each third work gripping portion 62C is provided with a pair of small air cylinders 66, 66 fixed to a pair of slide rails 61A, 61A. And the holding member 63 is being fixed to the front-end | tip of a pair of linear motion rod 66A of each small air cylinder 66. As shown in FIG. As a result, the third workpiece gripping part 62C group can be opened and closed at an arbitrary timing. Then, the third workpiece gripping part 62C receives and grips the cylindrical workpiece W sandwiched between the punch 22 and the knockout pin in one stage from the lateral direction, and places the gripped cylindrical workpiece W on the next stage. When the cylindrical workpiece W is conveyed and sandwiched between the punch 22 and the knockout pin, the cylindrical workpiece W is opened and released.

  The second workpiece gripping part 62B group is provided with a pair of strip sliders 64, 64 that are common to all of them. The pair of sub-sliders 64, 64 are overlapped on the pair of slide rails 61A, 61A and supported so as to be linearly movable in the front-rear direction. All of the plurality of front gripping members 63 in the second work gripping portion 62B group are fixed to the front subslider 64, and the rear side in the second work gripping portion 62B group is fixed to the rear subslider 64. All of the plurality of gripping members 63 are fixed. Further, the pair of sub-sliders 64 and 64 are driven so as to be brought into contact with and separated from each other by an air driving source (not shown), whereby the entire second workpiece gripping part 62 group is simultaneously opened and closed.

  As shown in FIG. 3, the idle stage S2 group includes dummy pins for transferring the cylindrical workpiece W to and from the second workpiece gripping portion 62, like the punch 22 in the machining stage S3 described above. 14 or a dummy punch 26 is provided. Specifically, a common punch support plate 27 extending in the lateral direction is provided above the idle stage S2 group excluding the leading idle stage S2, and the lower surface of the punch support plate 27 corresponds to each idle stage S2. The dummy punch 26 is provided. The punch support plate 27 is driven up and down by an air cylinder 28. Each dummy punch 26 holds the cylindrical workpiece W with the communication base 12, and the cylindrical workpiece W is transferred to and from the second workpiece gripping portion 62B.

  Further, as shown in FIG. 4, the leading idle stage S2 has a linear motion support hole 34A formed downward from the workpiece transfer surface 13, and the elevating unit 16 is accommodated in the linear motion support hole 34A. Yes. The elevating unit 16 has a main body 16H supported in the linear motion support hole 34A so as to be movable up and down. On the upper surface of the main body 16H, an opposing sliding contact protrusion 16T disposed in parallel with the width direction of the workpiece transfer surface 13 is provided, and a spring accommodating chamber 16C that accommodates the compression coil spring 15 is provided inside the main body 16H. Is provided. In addition, a guide hole 16A is formed through the portion of the upper portion of the spring accommodating chamber 16C that is sandwiched between the opposing sliding contact protrusions 16T. The aforementioned dummy pin 14 is fitted in the guide hole 16A so as to be linearly movable, is urged upward by the compression coil spring 15, and normally protrudes upward from the opposing sliding contact protrusion 16T.

  Furthermore, a pad 36P is laid on a portion of the lower surface of the punching die holder 36 facing the linear motion support hole 34A. Then, the lifting unit 16 is raised by the air cylinder 17 shown in FIG. 3 to push up the cylindrical workpiece W from below with the dummy pins 14 and hold the cylindrical workpiece W between the dummy pins 14 and the pads 36P. Thus, the cylindrical workpiece W is transferred to and from the second workpiece gripping portion 62. Note that the opposing sliding contact projection 16T is used for expanding the grip plates 69 and 69 of the first workpiece gripping portion 62A described below.

  As shown in FIG. 6, the first workpiece gripping portion 62A has gripping member support blocks 67 and 67 fixed to the slide rails 61A and 61A. Each gripping member support block 67 is formed with a guide hole 67A that opens toward the stage. Further, each gripping member 63 of the first workpiece gripping portion 62A has a structure in which the linear motion rod 63A extends from the back surface of the gripping plate 69, and the linear motion rod 63A is linearly moved into the guide hole 67A of the gripping member support block 67. It can be fitted. Further, a compression coil spring 68 is provided between the inner surface of the guide hole 67A and the linear motion rod 63A, and each gripping member 63 is urged toward the stage. Further, a guide pin 67B protrudes from the inner side surface of the guide hole 67A and engages with a regulation groove 63B formed on the side surface of the linear motion rod 63A, thereby limiting the movable range of the gripping member 63. The inner surface of the guide hole 67A is covered with a sliding metal.

  As shown in FIG. 4, the gripping plate 69 has a horizontally long rectangle when viewed from the front-rear direction. Further, as shown in FIG. 6, the distal end portion of the linear motion rod 63 </ b> A is disposed at an upper position in the center in the lateral direction of the back surface of the gripping plate 69, and the bottom surface of the gripping plate 69 is adjacent to the work transport surface 13. Yes.

  As shown in FIG. 7, an arcuate groove 69 </ b> A corresponding to the outer surface shape of the cylindrical workpiece W is provided at the center in the lateral direction of the gripping plate 69. As shown in FIG. 6, the arc groove 69 </ b> A extends over the entire holding plate 69 in the vertical direction. Further, the upper portion of the circular arc groove 69A from the position near the upper end is shallower in a stepped shape, and the stepped surface at the position near the upper end is used as a crowning locking portion 69B for locking to the upper surface of the cylindrical workpiece W. It has become.

  The entire gripping plate 69 is made of a metal member, and a resin member 69J is embedded in the center of the metal member in the lateral direction on the front side surface of the gripping plate 69. Further, the resin member 69J is disposed above the intermediate portion in the vertical direction, and the upper portion of the circular arc groove 69A from the intermediate portion in the vertical direction is constituted by the resin member 69J.

  A lower sliding surface 69 </ b> C is formed at the lower end portion of the gripping plate 69 by chamfering the corners between the lower surface and the front side surface of the gripping plate 69. For example, the lower sliding surface 69C is inclined at an angle of approximately 20 to 35 degrees with respect to the vertical direction. Further, as shown in FIG. 7, lateral sliding surfaces 69 </ b> D and 69 </ b> D are formed at both lateral ends of the gripping plate 69 by chamfering corners between the lateral end surfaces and the front side surface of the gripping plate 69. Has been. These lateral sliding surfaces 69D and 69D are inclined at an angle of approximately 20 to 35 degrees with respect to the lateral direction, for example.

  Since the first workpiece gripping portion 62A does not include a drive source as described above, the gripping members 63 and 63 are opened and closed by receiving external force. For this purpose, as shown in FIG. 4, the idle stage S2 is provided with the above-described opposing sliding contact protrusion 16T, and the workpiece receiving stage S1 is provided with the opening / closing tool 43 according to the present invention.

  As shown in FIG. 10, the opening / closing tool 43 has a structure in which a pair of sliding contact protrusions 44, 44 protrude from the upper surface of a block part 43 </ b> A (corresponding to a “tool base part” of the present invention). As shown in FIG. 9, the block portion 43 </ b> A has a rectangular shape in which the planar shape extends in the width direction of the workpiece conveyance surface 13, and sliding contact protrusions 44 and 44 are arranged at both ends in the long side direction. Yes. On the other hand, as shown in FIG. 6, a support sleeve 47 having a rectangular support hole 47 </ b> A corresponding to the planar shape of the block portion 43 </ b> A is fitted to the upper inner surface of the linear motion support hole 18. The opening / closing tool 43 is fitted in the support hole 47A and supported so as to be linearly movable. As shown in FIG. 10, a through hole 43 </ b> D having a rectangular cross section extends in the vertical direction in a portion of the block portion 43 </ b> A sandwiched between the sliding contact projections 44, 44. And as shown in FIG. 6, the 3rd pressurization member structure part 41C of the lower pressurization member 41 is supported by the through-hole 43D so that a linear motion is possible.

  As shown in FIG. 5, a pair of support shafts 48, 48 are suspended from both ends in the longitudinal direction on the lower surface of the opening / closing tool 43, and pass through support holes 19 </ b> B, 19 </ b> B formed in the support plate 19. Further, the nuts 19N and 19N screwed to the lower ends of the support shafts 48 and 48 come into contact with the lower surface of the support plate 19, so that the opening / closing tool 43 is positioned at the upper end position of the movable range. Further, compression coil springs 49, 49 are inserted into the support shafts 48, 48, and the compression coil springs 49, 49 are in a stretched state between the support plate 19 and the opening / closing tool 43, and the opening / closing tool 43 is set to the upper end position. Energized. Then, as shown in FIG. 6, when the opening / closing tool 43 is disposed at the upper end position, the pair of sliding contact projections 44, 44 protrudes upward from the workpiece transfer surface 13 and 1 of the first workpiece gripping portion 62 </ b> A. An interruption is made between the pair of gripping members 63, 63, and the first work gripping portion 62A is held open against the compression coil springs 68, 68.

  As shown in FIG. 10, vertical grooves 44 </ b> A and 44 </ b> A are formed in the center in the lateral direction of the pair of sliding contact projections 44 and 44 from the upper surface to the position near the lower end. When the lower pressure member 41 moves downward relative to the opening / closing tool 43, the head portion 41H is accommodated between the pair of sliding contact projections 44, 44. Specifically, as shown in FIG. 11, both longitudinal ends of the first pressure member constituting portion 41A are received in the longitudinal grooves 44A and 44A, and the lower surface of the second pressure member constituting portion 41B is Then, it abuts against the opening edge of the through hole 43D of the opening / closing tool 43. Then, when the lower pressure member 41 further moves to the lower end position of the movable range, the opening / closing tool 43 is pushed down by the lower pressure member 41, and as shown in FIG. 12, a pair of sliding contact projections 44, The whole 44 except the upper end portion is immersed in the support hole 47A. Then, the pair of gripping members 63, 63 approach each other by the elastic force of the compression coil springs 68, 68, and the first work gripping portion 62A is closed.

  As shown in FIG. 11, in the state where the second pressure member constituting portion 41B is in contact with the opening edge of the through hole 43D of the opening / closing tool 43, the upper surface of the first pressure member constituting portion 41A is slid. It becomes substantially flush with the upper surface of the contact projection 44, and the lower surface of the first pressure member constituting portion 41A is slightly lifted from the bottom surface of the vertical groove 44A.

  As shown in FIG. 10, an upper sliding surface 46 is formed at the upper end portion of each sliding contact projection 44 by chamfering the corner portion between the side surface and the upper surface arranged at the end portion in the front-rear direction of the opening / closing tool 43. Has been. Further, as shown in FIG. 6, the inclination angle of the upper sliding surface 46 is the same as that of the lower sliding surface 69 </ b> C of the gripping member 63. When the sliding contact projections 44 and 44 are retracted downward from between the gripping members 63 and 63, the upper sliding surface 46 and the lower sliding surface 69C are in sliding contact with each other, and the first workpiece gripping portion 62A is closed. The operation is smooth.

  As shown in FIG. 10, at both ends in the horizontal direction of each sliding contact projection 44, both angles of the side surface arranged at the front-rear direction end portion of the opening / closing tool 43 and the both side surfaces arranged at both ends in the horizontal direction are provided. A pair of lateral sliding surfaces 45, 45 are formed by chamfering the portion. Further, as shown in FIG. 9, the inclination angles of the lateral sliding surfaces 45, 45 are the same as the lateral sliding surfaces 69 </ b> D, 69 </ b> D of the gripping member 63. When the first workpiece gripping portion 62A is closed, the opening / closing tool 43 is disposed at the upper end position when returning from the idle stage S2 to the workpiece receiving stage S1, and the lateral sliding surface 69D of the gripping member 63 is By the sliding contact with the lateral sliding surface 45 of the opening / closing tool 43, the sliding contact projections 44, 44 are interrupted between the gripping members 63, 63, and the first workpiece gripping portion 62A is opened.

  In addition, a pair of upper sliding surfaces (not shown) is formed on the upper portion of the opposing sliding contact projection 16T as well as the pair of upper sliding surfaces 46, 46 of the opening / closing tool 43. When the first workpiece gripping portion 62A is closed and moved from the workpiece receiving stage S1 to the idle stage S2, the opposed sliding contact portion 16T is lowered between the gripping members 63 and 63 of the first workpiece gripping portion 62A. The opposing sliding contact projection 16T is brought into contact with the gripping members 63, 63 by sliding contact between the pair of upper sliding surfaces of the opposing sliding contact projection 16T and the lower sliding surfaces 69C, 69C of the gripping members 63, 63. In the meantime, the first workpiece gripping part 62A is opened.

  This completes the description of the configuration of the transfer press 10 of the present embodiment. Next, the function and effect of the transfer press 10 will be described. When the transfer press 10 is activated, the hoop material V is fed onto the punching die 37 with the punching punch 39 and the blank forming punch 40 waiting above the punching die 37 as shown in FIG. Be paid. Then, as shown in FIG. 6, the punching punch 39 enters the punching hole 37 </ b> A of the punching die 37, punches the blank material B from the hoop material V, and presses it against the upper surface of the blank forming die 38.

  At this time, the lower pressure member 41 is pushed up to the upper end position of the movable range by the air cylinder 42 and is directed to the lower surface of the blank material B in the drawing hole 38A. Then, with the lower pressurizing member 41 receiving the pushing force from the air cylinder 42, the blank forming punch 40 descends and pushes the blank material B into the drawing hole 38A of the blank forming die 38, and the lower pressurizing member 41 is pushed down following the blank forming punch 40. Thereby, the blank material B is squeezed while being supported by the lower pressure member 41 from below, and the downward escape of the blank material B, which has been a problem in the past, is suppressed.

  Further, since the outer edge portion of the blank material B is squeezed while being sandwiched between the punching punch 39 and the upper surface of the blank forming die 38, the occurrence of wrinkles in the blank material B is also suppressed. And the cylindrical workpiece W is shape | molded from the blank material B, and goes to the workpiece | work receiving stage S1 below 38 A of drawing hole 38A with the blank shaping | molding punch 40 and the lower pressurization member 41. FIG. After the blank material B is formed into the cylindrical workpiece W, the supply of air to the air cylinder 42 is switched, and the lower pressure member 41 is pulled downward by the air cylinder 42 and descends.

  Further, the punch 22 group of the drawing press machine 20 pushes the cylindrical workpiece W into the die hole of the die 24 while the blank forming punch 40 pushes the blank material B into the drawing hole 38A. While the blank forming punch 40 moves down together with the cylindrical workpiece W and moves toward the workpiece receiving stage S1, the punch 22 group moves up together with the cylindrical workpiece W and the knockout pin and moves toward the machining stage S3. At this time, the transfer slide 61 of the transfer device 60 moves from the end of the movable stroke toward the start end.

  When the transfer slide 61 moves to the start end side, the second and third workpiece gripping portions 62B and 62C are held in an open state by a drive source provided to themselves, and the idle stage on the start end side from the current position. Go to S2 or processing stage S3. On the other hand, the first workpiece gripping portion 62A is held in a closed state by the resilient force of the compression coil springs 68 and 68 and moves toward the workpiece receiving stage S1.

  At this time, in the workpiece receiving stage S1, the open / close tool 43 is placed at the upper end position, and the slide contact projections 44 and 44 stand by in a state of protruding upward from the workpiece conveying surface 13. Then, in the process in which the first workpiece gripping portion 62A reaches the workpiece receiving stage S1, the lateral sliding surfaces 69D and 69D of the first workpiece gripping portion 62A shown in FIG. , 45 slidably contact the pair of sliding contact projections 44, 44 between the pair of gripping members 63, 63, and the pair of gripping members 63, 63 are opened as shown in FIG.

  As shown in FIG. 11, a part of the cylindrical workpiece W is accommodated between the pair of gripping members 63, 63, and the upper end portion of the lower pressure member 41 is accommodated between the sliding contact protrusions 44, 44. . Then, the blank forming punch 40 and the lower pressure member 41 are further lowered, and the lower sliding surfaces 69C and 69C of the gripping members 63 and 63 are in sliding contact with the upper sliding surfaces 46 and 46 of the sliding contact protrusions 44 and 44, respectively. While the opening / closing tool 43 is pushed down, the gripping members 63 and 63 are gradually closed. Then, as shown in FIG. 12, when the opening / closing tool 43 reaches the position near the lower end of the movable range, the cylindrical workpiece W is gripped between the pair of gripping members 63, 63, and the crowns of both gripping members 63, 63 are The upper end portion of the cylindrical workpiece W is locked to the pay-off locking portions 69B and 69B.

  Further, this position is the bottom dead center of the blank forming punch 40, and the operation of the blank forming punch 40 is reversed after the upper end portion of the cylindrical workpiece W is locked to the crown-pasting locking portions 69B and 69B. And start to rise. On the other hand, the lower pressure member 41 further descends and moves the opening / closing tool 43 to the lower end position as shown in FIG. Then, with the lower pressure member 41 holding the open / close tool 43 at the lower end position, the cylindrical workpiece W is detached from the blank forming punch 40, and the first workpiece gripping portion 62 </ b> A is removed from the blank forming punch 40. Will be in a state of receiving. At this time, the second and third workpiece gripping portions 62B and 62C also receive the cylindrical workpiece W from the punch 22 or the like (see FIGS. 8 and 2).

  Then, the transfer slide 61 moves to the end side of the movable stroke, and the first to third workpiece gripping portions 62A, 62B, 62C receive the cylindrical workpiece W on the dummy pin 14, dummy punch 26 or punch 22 of the adjacent stage. hand over. At that time, in the leading idle stage S2, the opposing sliding contact protrusion 16T (see FIG. 4) enters between the gripping members 63, 63 of the first work gripping portion 62A from below and enters the gripping members 63, 63. 63 is opened, and the cylindrical workpiece W is released. Further, the cylindrical work W released by the third work gripping part 62C at the end is dropped and conveyed onto the belt conveyor 10B (see FIG. 3) provided at the end part of the transfer press machine 10. Then, the next blank B is punched, the above-described operation is repeated, and a plurality of cylindrical workpieces W are sequentially formed.

  As described above, in the transfer press 10 of the present embodiment, when the blank material B is formed into the cylindrical workpiece W by the blank forming punch 40, the lower pressure member 41 causes the blank material B to be formed in the drawing hole 38A. Since it is supported from below and descends following the blank forming punch 40, the downward escape of the blank B, which has been a problem in the past, can be suppressed, and a cylindrical work W with high shape quality can be formed. become.

  By the way, when the cylindrical workpiece W is transferred from the blank forming punch 40 to the pair of gripping members 63, 63 on the start end side of the transfer device 60, the gripping members 63, 63 are elastically applied by the compression coil springs 68, 68. Need to open against. As a configuration for that purpose, a configuration in which the pair of gripping members 63 and 63 are pushed and expanded by the cylindrical workpiece W is conceivable. However, this causes a problem that the cylindrical workpiece W is deeply damaged by sliding contact with the gripping members 63 and 63. Arise. On the other hand, when the upper end portion of the lower pressurizing member 41 is sized to project laterally from the cylindrical workpiece W and the pair of gripping members 63 and 63 are pushed and expanded at the upper end portion of the lower pressurizing member 41, The upper end portion of the lower pressure member 41 cannot be inserted into the drawing hole 38A, and the escape of the blank material B at the time of the above-described drawing cannot be suppressed.

  On the other hand, in the transfer press machine 10 of the present embodiment, the opening / closing tool 43 is provided on the workpiece receiving stage S1 so as to be able to reciprocate, and the opening / closing tool 43 is in sliding contact with the pair of gripping members 63, 63 so 63, the cylindrical workpiece W can be transferred from the blank molding punch 40 to the pair of gripping members 63, 63 without deeply scratching the cylindrical workpiece W. Also in this point, according to the transfer press machine 10 of this embodiment, it becomes possible to shape | mold the cylindrical workpiece W of high shape quality.

  Further, in the case where the cylindrical workpiece W is formed from the blank material B above the transfer device 60 as in the transfer press machine 10 of the present embodiment, generally, the periphery of the workpiece receiving stage S1 is the blank forming die 38 or the die. In this embodiment, the opening / closing tool 43 advances and retreats with respect to the pair of gripping members 63 and 63 of the transfer device 60, although it is narrowed by the support bases 36 </ b> D and 36 </ b> D supported from below and the components of the transfer device 60. Therefore, the open / close tool 43 can be installed without reducing the strength by moving the blank forming die 38, the support base 36D, etc. away from the workpiece receiving stage S1. Moreover, the opening / closing tool 43 waits at the upper end position in sliding contact with the pair of gripping members 63, 63 of the first work gripping portion 62A moving toward the work receiving stage S1. Since the pair of gripping members 63, 63 of the workpiece gripping part 62A are opened, the useless waiting time of the pair of gripping members 63, 63 is reduced, and the transfer press 10 can be operated at high speed. Furthermore, since the opening / closing tool 43 is pushed down by the lower pressure member 41 and moves from the upper end position to the lower end position, the drive source is shared between the lower pressure member 41 and the opening / closing tool 43, resulting in a simple configuration. . Further, since the air cylinder 42 is provided as a drive source for driving the lower pressurizing member 41, the lower pressurizing member 41 can be easily moved by the blank forming punch 40 to be lowered by adjusting the atmospheric pressure.

[Other Embodiments]
The present invention is not limited to the above-described embodiment. For example, the embodiments described below are also included in the technical scope of the present invention, and various other than the following can be made without departing from the scope of the invention. It can be changed and implemented.

(1) In the above-described embodiment, the blank material B is punched from the hoop material V and drawn. However, a blank material prepared in advance may be drawn.

(2) In the above embodiment, the opening / closing tool 43 is driven by receiving power from the same drive source as the lower pressure member 41, but the opening / closing tool 43 is a drive source different from the lower pressure member 41. It is good also as a structure driven by receiving motive power from. That is, the open / close tool 43 is driven by an air cylinder different from the air cylinder 42 that is the drive source of the lower pressure member 41, or the open / close tool 43 is driven by the second servo motor that is the drive source of the ram 31. You may do it.

(3) In the above embodiment, the opening / closing tool 43 is configured to advance and retract from below with respect to the gripping members 63, 63 of the first workpiece gripping part 62A. Of these, it may be arranged on the start end side from the workpiece receiving stage S <b> 1, and may be configured to open and close the gripping members 63, 63 by moving back and forth in the lateral direction between the gripping members 63, 63.

(4) In the above embodiment, the gripping members 63 and 63 are gradually closed by sliding contact between the lateral sliding surfaces 45 and 45 of the opening / closing tool 43 and the lower sliding surfaces 69C and 69C of the gripping members 63 and 63. However, the gripping members 63 and 63 may be configured to close sharply without providing the lateral sliding surface 45 and the lower sliding surface 69C.

DESCRIPTION OF SYMBOLS 10 Transfer press machine 34 Support base 38 Blank forming die 38A Drawing hole 40 Blank forming punch 41 Lower pressure member 41H Head part 42 Air cylinder 43 Opening / closing tool 43A Block part (tool base part)
43D Through hole 44 Sliding contact projection 60 Transfer device 63 Holding member B Blank material S1 Work receiving stage S3 Processing stage W Cylindrical work

Claims (7)

Cylindrical workpieces with one end are intermittently conveyed by a transfer device from the start end side to the end side of a group of processing stages arranged in a row and sequentially formed, and the workpiece receiving stage upstream of the processing stage group A blank forming die having a drawing hole is provided above, a blank material is pushed into the drawing hole by a blank forming punch and formed into the cylindrical workpiece, and a pair of gripping members on the start end side of the transfer device A pair of gripping members on the starting end side are supported so as to be able to come in contact with each other and are urged to approach each other.
A lower pressurizing member that is provided on the workpiece receiving stage so as to be movable up and down, supports the blank material from below, and descends following the blank forming punch;
From the pair of gripping members that are provided on the workpiece receiving stage so as to be able to reciprocate, slide in contact with the pair of gripping members before receiving the cylindrical workpiece, and open the gripping members. A transfer press machine comprising: an opening / closing tool that is spaced apart to close the gripping members and grips the cylindrical workpiece by the pair of gripping members.   The transfer press according to claim 1, wherein the opening / closing tool moves up and down between an upper end position interrupted between the pair of gripping members and a lower end position shifted downward of the pair of gripping members. A support base having a linear motion support hole extending on an extension line of the drawing hole is provided below the moving region of the pair of gripping members,
The opening / closing tool has a structure in which a pair of sliding contact protrusions protrudes from an upper surface of a tool base portion supported so as to be linearly movable in the linear motion support hole. And is configured to open the pair of gripping members in sliding contact with the pair of gripping members;
The transfer press according to claim 2, wherein the lower pressurizing member is supported so as to be linearly movable in a through-hole penetrating vertically between the pair of sliding contact protrusions in the tool base portion.   4. The transfer according to claim 3, wherein a head portion projecting laterally is provided at an upper end portion of the lower pressure member, and the head portion is configured to fit between the pair of sliding contact projections. Press machine.   The open / close tool opens the pair of gripping members by waiting in sliding contact with the pair of gripping members moving toward the workpiece receiving stage at an upper end position of a movable range, and the upper end tool The transfer press according to any one of claims 2 to 4, wherein the transfer press is lowered from a position to close the pair of gripping members.   The transfer press according to any one of claims 2 to 5, wherein the opening / closing tool is urged toward an upper end position of a movable range and is lowered by the lower pressure member.   The transfer press machine according to claim 1, further comprising an air cylinder as a drive source for driving the lower pressure member.

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